ANNA-B112 - System integration manual
UBX-18009821 - R09
Appendix
Page 55 of 66
C1-Public
Table 18: Explanation of the abbreviations used
B
Antenna reference designs
Designers can take full advantage of ANNA-B112’s Single-Modular Transmitter certification approval
by integrating the u-blox reference design into their products. This approach requires compliance with
the following rules:
•
Only listed antennas can be used. Refer to ANNA-B112 Data sheet [2] for the listed antennas.
•
Schematics and parts used in the design must be identical to u-blox. RF components may show
different behavior at the frequencies of interest due to different construction and parasitic; use
u-blox’s validated parts for antenna matching.
•
PCB layout must be identical to the one provided by u-blox. Implement one of the reference designs
included in this section or contact u-blox.
•
The designer must use the stack-up provided by u-blox. RF traces on the carrier PCB are part of
the certified design.
Three different reference designs are available as listed below:
•
Using the internal antenna with the module in the corner of the PCB
•
Using the internal antenna with the module along the edge of the PCB
•
Using an external antenna by a short trace to a U.FL connector
B.1
Internal antenna reference design with module at PCB corner
When using the ANNA-B112 together with this antenna reference design, the circuit trace layout
must be made in strict compliance with the instructions below.
This section describes where the critical copper traces are positioned on the reference design.
